Belching - is involuntary or voluntary discharge of gas from the esophagus or stomach through the mouth by reducing the aperture. If the contents of the stomach enters the esophagus, then talk about regurgitation.
Belching may be a sign of disease of the esophagus and stomach, but may be completely random episode from healthy individuals with overeating, or use of fluids containing carbon dioxide (soda). Belching can cause physical stress.
Frequent or persistent regurgitation (spitting up) shows lesions of the esophagus or stomach - inflection of the stomach, stenosis of the gastric motility disorders of the esophagus and stomach, as well as hiatal hernia.
